Well, I wouldn't say garbage. But they are not the best devices. I have had a couple of Android tablets (both of which were returned) and from what I saw and have read in tablet-related forums, here are the answers to your questions...

Can you root an Android tablet? In just about all cases, yes. They have figured out how to root most of the tablets that are currently out.

Can you upgrade from 1.5 to 2.2? In most cases, no. The only tablet I have seen that could even come close to that is the Archos 5 Internet Tablet. It started out on 1.5/1.6 and I believe is currently on 2.0/2.1. I haven't seen a tablet currently on the market that runs 2.2. The Augen 7" runs 2.1 and the Augen has made claims to an upgrade to 2.2 coming later on.

Is it worth it to get a tablet? Only you can answer that. Right now, I can honestly say it isn't for me. Maybe it's the resistive screens, maybe it's the overall newess of the market. But this is all my own experience. Whatever you decide, good luck and I hope this helps.

Funny you know about Root, but not the different OS releases. dancedroid however, this is the first time I heard on 1.7. That must be a tablet specific OS.

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There are tablets out there that are claiming to be running Android 1.7. That is not a real version, but what the tablet sellers put in the description because they don't know (or a lot fof the time, care) what they are selling. the 1.7 part is actually the Chinese company's firmware number. They are usually running 1.5 or 1.6. But in the About Phone section, the firmware will be shown as 1.7.2 or something like that. The sellers take that number and say it's the version of Android. Really doesn't do anything but confuse people.